滑动摩擦支座隔震桥梁地震反应分析

发布时间：2018-03-31 15:43

本文选题：摩擦摆支座　切入点：近海桥梁　出处：《土木工程学报》2016年S2期

【摘要】：多滑面摩擦隔震支座具有刚度和阻尼的自适应性,在基于性能的桥梁抗震设计中有广泛的应用前景。本文以某近海连续梁桥为工程背景,考虑海洋软土条件,应用p-y法模拟桩-土相互作用,通过单摩擦摆(FPS)串联组成多滑动面摩擦摆支座(MFPS)模型,并建立全桥有限元模型。采用反应谱法和快速非线性分析(FNA)两种方法,对设置单滑面摩擦摆支座和多滑面摩擦摆支座的两种不同支座的隔震桥梁体系进行地震响应分析。对比分析两种方法得到的两种隔震桥梁结构的支座滞回性能和墩底剪力等的地震响应规律。研究结果表明,两种支座均具有较好的隔震效果,采用MFPS支座的桥墩的地震响应比FPS支座有所减小,且具有较大位移能力。
[Abstract]:Friction isolation bearings with multiple sliding surfaces have the self-adaptability of stiffness and damping, and have a wide application prospect in performance-based seismic design of bridges. In this paper, an offshore continuous beam bridge is taken as the engineering background and the conditions of marine soft soil are considered. The p-y method is used to simulate pile-soil interaction, and a multi-sliding surface friction pendulum bearing MFPS model is constructed by means of a single friction pendulum FPS in series, and a full-bridge finite element model is established. Two methods, the response spectrum method and the fast nonlinear analysis (FNA) method, are used to simulate the pile-soil interaction. The seismic response analysis of two kinds of isolated bridge systems with single sliding surface friction pendulum bearing and multi sliding surface friction pendulum bearing is carried out. The hysteretic behavior of two kinds of isolated bridge structures are compared and analyzed. The seismic response law of shearing forces at the bottom of the pier. The results show that, The seismic response of bridge piers with MFPS support is smaller than that of FPS bearing, and the displacement ability of the pier is larger than that of FPS support.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;华北科技学院;
【基金】：国家自然科学基金(51478022,51578022) 北京市教委科技计划项目(KZ201610005013)
【分类号】：U442.55

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